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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(7/6) = 0
1/x-7/6 = 0
1*x^-1 = 7/6 // : 1
x^-1 = 7/6
-1 < 0
1/(x^1) = 7/6 // * x^1
1 = 7/6*x^1 // : 7/6
6/7 = x^1
x = 6/7
x = 6/7
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